Tolong bantuin 1 sampai 4pakai jalanno asal
Jawaban:
1. x = 4+√31 atau x = 4-√31
2. x = 0 atau x = 8
3. x = -1/2 atau x = -3
4. x = 2/3 atau x = -5
Penjelasan dengan langkah-langkah:
1. x² – 8x – 15 = 0
a = 1 , b = -8 , c = = -15
Jadi, x = 4+√31 atau x = 4-√31
2. x² – 8x = 0
x (x-8) = 0
x = 0
x – 8 = 0
x = 8
Jadi, x = 0 atau x = 8
3. 2x² +7x + 3 = 0
(2x+1) (x+3) = 0
2x+1 = 0
2x = -1
x = -1/2
x+3 = 0
x = -3
Jadi, x = -1/2 atau x = -3
4. 3x² + 13 – 10 = 0
(3x-2) (x+5) = 0
3x-2 = 0
3x = 2
x = 2/3
x+5 = 0
x = -5